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Current weather in Roundup is clear sky.

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Weather data for Roundup is updated regularly with the latest available observations and forecasts.

Now · 3:47 PM

Roundup Weather & Hourly Forecast

United States · Montana · 59072

68°F

Sunny

Feels like: 60°F

💧 Humidity 33% 🌡 Pressure 29.97 inHg 💨 Wind 8 mph 👁 Visibility 33.7 mi ☁ Clouds 0% ☀️ UV index 3.9 · Moderate 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for Roundup

Today

4:00 PM

Sunny

68° 💧 None 💨 8 mph H 33%29.97 inHg

7:00 PM

Sunny

62° 💧 None 💨 7 mph H 41%29.97 inHg

10:00 PM

Clear night

55° 💧 None 💨 9 mph H 54%30.03 inHg

Tomorrow

1:00 AM

Mostly clear night

50° 💧 None 💨 6 mph H 63%30.03 inHg

4:00 AM

Clear night

46° 💧 None 💨 3 mph H 75%30.03 inHg

7:00 AM

Sunny

44° 💧 None 💨 3 mph H 78%30.12 inHg

10:00 AM

Sunny

57° 💧 None 💨 7 mph H 50%30.15 inHg

1:00 PM

Sunny

66° 💧 None 💨 11 mph H 39%30.15 inHg

4:00 PM

Sunny

68° 💧 None 💨 11 mph H 37%30.15 inHg

7:00 PM

Sunny

62° 💧 None 💨 7 mph H 51%30.18 inHg

10:00 PM

Clear night

53° 💧 None 💨 5 mph H 71%30.27 inHg

Thursday

1:00 AM

Clear night

49° 💧 None 💨 4 mph H 84%30.27 inHg

4:00 AM

Clear night

48° 💧 None 💨 1 mph H 86%30.24 inHg

7:00 AM

Sunny

47° 💧 None 💨 1 mph H 91%30.24 inHg

10:00 AM

Mostly cloudy

60° 💧 None 💨 1 mph H 65%30.18 inHg

1:00 PM

Overcast

71° 💧 None 💨 5 mph H 45%30.09 inHg

Today

4:00 PM

Sunny

68° 💧 None 💨 8 mph H 33%29.97 inHg

5:00 PM

Sunny

67° 💧 None 💨 9 mph H 33%29.97 inHg

6:00 PM

Sunny

66° 💧 None 💨 9 mph H 34%29.97 inHg

7:00 PM

Sunny

62° 💧 None 💨 7 mph H 41%29.97 inHg

8:00 PM

Clear night

58° 💧 None 💨 9 mph H 51%30.00 inHg

9:00 PM

Clear night

57° 💧 None 💨 10 mph H 54%30.03 inHg

10:00 PM

Clear night

55° 💧 None 💨 9 mph H 54%30.03 inHg

11:00 PM

Clear night

53° 💧 None 💨 7 mph H 56%30.03 inHg

Tomorrow

12:00 AM

Mostly clear night

52° 💧 None 💨 6 mph H 59%30.03 inHg

1:00 AM

Mostly clear night

50° 💧 None 💨 6 mph H 63%30.03 inHg

2:00 AM

Mostly clear night

48° 💧 None 💨 4 mph H 67%30.03 inHg

3:00 AM

Clear night

47° 💧 None 💨 4 mph H 71%30.03 inHg

4:00 AM

Clear night

46° 💧 None 💨 3 mph H 75%30.03 inHg

5:00 AM

Clear night

45° 💧 None 💨 3 mph H 77%30.06 inHg

6:00 AM

Clear night

44° 💧 None 💨 3 mph H 78%30.06 inHg

7:00 AM

Sunny

44° 💧 None 💨 3 mph H 78%30.12 inHg

8:00 AM

Sunny

48° 💧 None 💨 4 mph H 68%30.15 inHg

9:00 AM

Sunny

53° 💧 None 💨 4 mph H 57%30.15 inHg

10:00 AM

Sunny

57° 💧 None 💨 7 mph H 50%30.15 inHg

11:00 AM

Sunny

61° 💧 None 💨 8 mph H 45%30.15 inHg

12:00 PM

Sunny

64° 💧 None 💨 10 mph H 42%30.15 inHg

1:00 PM

Sunny

66° 💧 None 💨 11 mph H 39%30.15 inHg

2:00 PM

Sunny

68° 💧 None 💨 10 mph H 38%30.15 inHg

3:00 PM

Sunny

68° 💧 None 💨 10 mph H 37%30.15 inHg

4:00 PM

Sunny

68° 💧 None 💨 11 mph H 37%30.15 inHg

5:00 PM

Sunny

67° 💧 None 💨 10 mph H 39%30.15 inHg

6:00 PM

Sunny

65° 💧 None 💨 10 mph H 43%30.18 inHg

7:00 PM

Sunny

62° 💧 None 💨 7 mph H 51%30.18 inHg

8:00 PM

Clear night

57° 💧 None 💨 7 mph H 61%30.21 inHg

9:00 PM

Clear night

55° 💧 None 💨 6 mph H 66%30.24 inHg

10:00 PM

Clear night

53° 💧 None 💨 5 mph H 71%30.27 inHg

11:00 PM

Clear night

51° 💧 None 💨 4 mph H 76%30.27 inHg

Thursday

12:00 AM

Clear night

50° 💧 None 💨 4 mph H 80%30.27 inHg

1:00 AM

Clear night

49° 💧 None 💨 4 mph H 84%30.27 inHg

2:00 AM

Clear night

49° 💧 None 💨 3 mph H 85%30.27 inHg

3:00 AM

Clear night

49° 💧 None 💨 2 mph H 85%30.24 inHg

4:00 AM

Clear night

48° 💧 None 💨 1 mph H 86%30.24 inHg

5:00 AM

Clear night

48° 💧 None 💨 2 mph H 88%30.24 inHg

6:00 AM

Clear night

47° 💧 None 💨 2 mph H 90%30.24 inHg

7:00 AM

Sunny

47° 💧 None 💨 1 mph H 91%30.24 inHg

8:00 AM

Mostly sunny

50° 💧 None 💨 2 mph H 86%30.24 inHg

9:00 AM

Partly cloudy

55° 💧 None 💨 1 mph H 75%30.21 inHg

10:00 AM

Mostly cloudy

60° 💧 None 💨 1 mph H 65%30.18 inHg

11:00 AM

Mostly cloudy

65° 💧 None 💨 3 mph H 56%30.15 inHg

12:00 PM

Overcast

68° 💧 None 💨 4 mph H 50%30.12 inHg

1:00 PM

Overcast

71° 💧 None 💨 5 mph H 45%30.09 inHg

2:00 PM

Mostly cloudy

72° 💧 None 💨 6 mph H 43%30.06 inHg

3:00 PM

Mostly sunny

73° 💧 None 💨 7 mph H 43%30.03 inHg

4:00 PM

Partly cloudy

74° 💧 None 💨 7 mph H 43%30.00 inHg

5:00 PM

Mostly cloudy

74° 💧 None 💨 6 mph H 44%29.97 inHg

6:00 PM

Overcast

73° 💧 None 💨 5 mph H 46%29.97 inHg

7:00 PM

Mostly cloudy

68° 💧 None 💨 3 mph H 59%29.94 inHg

8:00 PM

Overcast night

64° 💧 None 💨 3 mph H 68%29.94 inHg

9:00 PM

Partly cloudy night

62° 💧 None 💨 2 mph H 73%29.97 inHg

10:00 PM

Clear night

60° 💧 None 💨 1 mph H 77%29.97 inHg

11:00 PM

Clear night

59° 💧 None 💨 1 mph H 79%29.94 inHg

Friday

12:00 AM

Clear night

57° 💧 None 💨 1 mph H 82%29.97 inHg

1:00 AM

Mostly clear night

55° 💧 None 💨 2 mph H 87%29.97 inHg

2:00 AM

Clear night

54° 💧 None 💨 2 mph H 90%29.97 inHg

3:00 AM

Mostly clear night

54° 💧 None 💨 4 mph H 92%29.97 inHg

4:00 AM

Mostly clear night

54° 💧 None 💨 4 mph H 93%29.97 inHg

5:00 AM

Mostly clear night

53° 💧 None 💨 5 mph H 93%29.97 inHg

6:00 AM

Clear night

53° 💧 None 💨 5 mph H 93%29.97 inHg

9:00 AM

Sunny

62° 💧 None 💨 1 mph H 65%30.03 inHg

12:00 PM

Mostly sunny

73° 💧 None 💨 8 mph H 49%30.00 inHg

3:00 PM

Mostly cloudy

75° 💧 None 💨 9 mph H 47%29.94 inHg

6:00 PM

Light rain

72° 💧 None 💨 6 mph H 59%29.94 inHg

9:00 PM

Mostly cloudy night

65° 💧 None 💨 6 mph H 76%29.97 inHg

Saturday

12:00 AM

Moderate rain

59° 💧 None 💨 8 mph H 95%30.00 inHg

3:00 AM

Moderate rain

59° 💧 None 💨 7 mph H 97%30.00 inHg

6:00 AM

Overcast night

58° 💧 None 💨 4 mph H 96%30.00 inHg

9:00 AM

Overcast

61° 💧 None 💨 4 mph H 86%30.00 inHg

12:00 PM

Light rain

67° 💧 None 💨 4 mph H 68%29.94 inHg

3:00 PM

Mostly sunny

73° 💧 None 💨 3 mph H 49%29.88 inHg

6:00 PM

Partly cloudy

65° 💧 None 💨 8 mph H 69%29.91 inHg

9:00 PM

Partly cloudy night

58° 💧 None 💨 1 mph H 91%29.94 inHg

Sunday

12:00 AM

Mostly cloudy night

56° 💧 None 💨 1 mph H 96%29.97 inHg

3:00 AM

Partly cloudy night

54° 💧 None 💨 3 mph H 98%29.97 inHg

6:00 AM

Overcast night

52° 💧 None 💨 4 mph H 99%30.00 inHg

9:00 AM

Overcast

56° 💧 None 💨 5 mph H 84%30.03 inHg

12:00 PM

Overcast

69° 💧 None 💨 3 mph H 49%30.00 inHg

3:00 PM

Partly cloudy

74° 💧 None 💨 9 mph H 33%29.94 inHg

6:00 PM

Mostly sunny

72° 💧 None 💨 9 mph H 40%29.94 inHg

9:00 PM

Clear night

60° 💧 None 💨 5 mph H 63%30.03 inHg

Monday

12:00 AM

Clear night

53° 💧 None 💨 3 mph H 85%30.09 inHg

3:00 AM

Clear night

50° 💧 None 💨 4 mph H 93%30.09 inHg

6:00 AM

Clear night

48° 💧 None 💨 2 mph H 95%30.09 inHg

12:00 PM

Sunny

69° 💧 None 💨 0 mph H 51%30.09 inHg

6:00 PM

Sunny

72° 💧 None 💨 10 mph H 48%29.97 inHg

Tuesday

12:00 AM

Clear night

55° 💧 None 💨 3 mph H 85%30.03 inHg

6:00 AM

Clear night

48° 💧 None 💨 4 mph H 95%30.00 inHg

12:00 PM

Sunny

71° 💧 None 💨 3 mph H 46%29.94 inHg

6:00 PM

Mostly sunny

76° 💧 None 💨 6 mph H 35%29.80 inHg

Wednesday

12:00 AM

Mostly clear night

57° 💧 None 💨 3 mph H 76%29.85 inHg

6:00 AM

Mostly clear night

51° 💧 None 💨 4 mph H 89%29.83 inHg

12:00 PM

Sunny

75° 💧 None 💨 6 mph H 37%29.83 inHg

6:00 PM

Sunny

79° 💧 None 💨 3 mph H 34%29.77 inHg

Thursday

12:00 AM

Clear night

59° 💧 None 💨 4 mph H 76%29.88 inHg

6:00 AM

Clear night

54° 💧 None 💨 7 mph H 78%29.94 inHg

12:00 PM

Sunny

79° 💧 None 💨 8 mph H 31%29.94 inHg

6:00 PM

Mostly sunny

81° 💧 None 💨 5 mph H 28%29.85 inHg

Friday

12:00 AM

Mostly clear night

64° 💧 None 💨 2 mph H 52%29.94 inHg

6:00 AM

Clear night

55° 💧 None 💨 3 mph H 70%29.94 inHg

12:00 PM

Sunny

78° 💧 None 💨 6 mph H 32%29.94 inHg

6:00 PM

Mostly cloudy

78° 💧 None 💨 10 mph H 39%29.88 inHg

Saturday

12:00 AM

Partly cloudy night

61° 💧 None 💨 5 mph H 77%29.94 inHg

6:00 AM

Partly cloudy night

57° 💧 None 💨 1 mph H 86%29.97 inHg

12:00 PM

Partly cloudy

74° 💧 None 💨 3 mph H 55%29.91 inHg

6:00 PM

Sunny

80° 💧 None 💨 8 mph H 42%29.74 inHg

Sunday

12:00 AM

Mostly clear night

67° 💧 None 💨 1 mph H 59%29.65 inHg

6:00 AM

Mostly clear night

58° 💧 None 💨 7 mph H 80%29.65 inHg

12:00 PM

Mostly sunny

80° 💧 None 💨 16 mph H 30%29.71 inHg

6:00 PM

Mostly sunny

74° 💧 None 💨 10 mph H 32%29.74 inHg

Monday

12:00 AM

Mostly clear night

57° 💧 None 💨 1 mph H 70%29.80 inHg

6:00 AM

Clear night

51° 💧 None 💨 2 mph H 49%29.83 inHg

12:00 PM

Sunny

69° 💧 None 💨 21 mph H 21%29.80 inHg

6:00 PM

Sunny

68° 💧 None 💨 10 mph H 27%29.77 inHg

Tuesday

12:00 AM

Clear night

51° 💧 None 💨 1 mph H 58%29.88 inHg

6:00 AM

Clear night

45° 💧 None 💨 4 mph H 76%29.94 inHg

12:00 PM

Sunny

67° 💧 None 💨 3 mph H 33%29.94 inHg

6:00 PM

Sunny

69° 💧 None 💨 10 mph H 33%29.80 inHg

Wednesday

12:00 AM

Clear night

54° 💧 None 💨 6 mph H 56%29.83 inHg

6:00 AM

Overcast night

53° 💧 None 💨 4 mph H 62%29.74 inHg

In Roundup and, more broadly, across the state of Montana: The late afternoon will feature a mix of sun and clouds, with temperatures cooling into the low to mid-50s. Winds from the northeast will be moderate, averaging around 12 mph, with gusts reaching up to 24 mph. No significant rainfall is expected during this time, so the evening should remain dry. As the night progresses, expect temperatures to stay in the low 50s, with the wind gradually easing. Overall, it will be a cool and breezy evening with partly cloudy skies.

15-Day Weather Outlook for Roundup

TomorrowTomorrow

Mostly cloudy 67°/45° 💧 None 💨 12 mph

Thursday, Sep 17Thu Sep 17

Mostly sunny 74°/46° 💧 None 💨 8 mph

Friday, Sep 18Fri Sep 18

Mostly cloudy 75°/55° 💧 0.031 in 💨 9 mph

Saturday, Sep 19Sat Sep 19

Moderate rain 68°/57° 💧 0.867 in 💨 7 mph

Sunday, Sep 20Sun Sep 20

Light rain 72°/54° 💧 0.181 in 💨 9 mph

Monday, Sep 21Mon Sep 21

Sunny 71°/49° 💧 0.423 in 💨 3 mph

Tuesday, Sep 22Tue Sep 22

Sunny 72°/50° 💧 None 💨 8 mph

Wednesday, Sep 23Wed Sep 23

Overcast 75°/53° 💧 None 💨 9 mph

Thursday, Sep 24Thu Sep 24

Mostly sunny 78°/52° 💧 None 💨 5 mph

Friday, Sep 25Fri Sep 25

Mostly sunny 78°/54° 💧 0.055 in 💨 19 mph

Saturday, Sep 26Sat Sep 26

Partly cloudy 68°/44° 💧 0.008 in 💨 13 mph

Sunday, Sep 27Sun Sep 27

Overcast 68°/47° 💧 0.031 in 💨 6 mph

Monday, Sep 28Mon Sep 28

Mostly sunny 64°/44° 💧 None 💨 10 mph

Tuesday, Sep 29Tue Sep 29

Mostly sunny 67°/44° 💧 None 💨 5 mph

Wednesday, Sep 30Wed Sep 30

Sunny 69°/69° 💧 None 💨 5 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Roundup

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Roundup

Hourly forecast · Updated every 2 hours

Fair

Nearest forecast value 4:00 PM

PM2.5 Fine particles Good 0,7µg/m³

Microscopic particles that can penetrate deep into the lungs. Elevated concentrations can especially affect children, older adults and people with respiratory conditions.

PM10 Particulate matter Good 1,9µg/m³

Includes dust, pollen and other airborne particles. High concentrations may irritate the respiratory system.

O₃ Ozone Fair 87,7µg/m³

Ground-level ozone can irritate the eyes and respiratory system when concentrations are elevated.

NO₂ Nitrogen dioxide Good 0,3µg/m³

A gas emitted mainly by traffic and some industrial activity. High exposure can affect respiratory health.

Air quality is acceptable for most people.

UV & HEALTH

UV, Sun & Health Outlook in Roundup

Maximum daily UV Today, tomorrow and the following day show the maximum UV index forecast for each day.

0–2 Low 3–5 Moderate 6–7 High 8–10 Very high 11+ Extreme

Today UV 5,2Moderate 🙂Fair

Tomorrow UV 5,0Moderate 🙂Fair

Thursday UV 4,4Moderate 🙂Fair

Friday UV 5,2Moderate 🙂Fair

Saturday UV 4,2Moderate 🙂Fair

Sunday UV 6,0High —Unavailable

Monday UV 7,0High —Unavailable

Hourly UV index today

4:00 PMUV 2,6 5:00 PMUV 1,3 6:00 PMUV 0,5 7:00 PMUV 0,0

Today's weather health advice Open today's recommendations.

Moderate UV risk

Sunglasses and sun protection are recommended for prolonged exposure.

Acceptable air quality

Air quality is acceptable for most people. Very sensitive people may want to reduce prolonged exertion.

Comfortable temperature conditions

Temperatures should feel comfortable for most people, with no particular heat or cold precautions needed.

Good conditions for outdoor activities

Outdoor activities can generally be enjoyed normally, with sun protection adjusted to the UV level.

WIND OUTLOOK

Hourly Wind Forecast for Roundup

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · ROUNDUP, MONTANA

Tonight's Stargazing & Shooting Stars

Excellent observing conditions. Best local viewing window: 4:00 AM–5:00 AM.

98/100Best-hour score

BEST TIME TONIGHT 4:00 AM–5:00 AM Astronomical darkness: 9:09 PM–5:10 AM

☁ Cloud cover 3% Real hourly forecast for the best viewing hour.

☾ Moonlight 22% Waxing Crescent · Moon below the horizon at the best viewing hour.

☄ Meteor activity September ε-Perseids Reference ZHR 8 · Radiant 80° high at the best hour.

✦ Estimated visible meteors 2–5/hour Local estimate after weather, moonlight and radiant-height adjustments.

Chance ≥1 meteor in 30 min80%

UPCOMING METEOR PERIODSStart, peak and end dates · weather should be checked closer to the peak.

SEP 5–SEP 21

September ε-PerseidsStart SEP 5 · Peak SEP 9 · End SEP 21 · ZHR 8 · 6% Moon at peak

ACTIVE NOW

SEP 20–NOV 20

Southern TauridsStart SEP 20 · Peak NOV 5 · End NOV 20 · ZHR 7 · 20% Moon at peak

UPCOMING

OCT 2–NOV 7

OrionidsStart OCT 2 · Peak OCT 21 · End NOV 7 · ZHR 20 · 77% Moon at peak

UPCOMING

OCT 20–DEC 10

Northern TauridsStart OCT 20 · Peak NOV 12 · End DEC 10 · ZHR 5 · 7% Moon at peak

UPCOMING

Experimental local observing estimate. Weather values come from the hourly forecast already used on this page. Moon position and astronomical darkness are calculated locally from time and coordinates. Meteor-shower ZHR describes ideal conditions and is not the number of meteors a person should expect to see locally.

DISCOVER WEATHER NEARBY Weather in other cities

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Forecast data for Roundup were last refreshed today at 3:47 PM. The current forecast period extends through 17/09/2026 at 1:00 PM. Weather, air-quality and UV-index data are provided through WEATHER-INFO.COM. Forecasts are produced automatically from the latest available data and are subject to periodic technical checks. This service is intended for general weather information.